| HNC | Head and neck cancer |
| R | Resection |
| R0 | Resection with clear margins |
| R1 | Resection with unclear microscopic margins |
| R2 | Resection with unclear macroscopic margins |
| PRISMA | Preferred Reporting Items for Systematic Reviews and Meta-Analyses |
| T | Tumor |
| N | Nodal |
| LR | Local recurrence |
| DFS | Disease-free survival |
| OS | Overall survival |
| SCC | Squamous cell carcinoma |
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